I'm not sure if there are any PVC cage makers in Europe or not, I would look and see if they are. large tanks like what you are talking about are very difficult to keep the proper temperatures/humidity in.
Here is a thread I wrote on PVC cages. if you can get one, they are the best... if not plastic tubs or a custom made enclosure would be best. Tanks suck lol
http://ball-pythons.net/forums/showt...With-Pictures!
I believe that the Zilla tanks have a wire mesh top